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The possessive adjective form is your. The possessive pronoun is yours.
Yes, their is a possessive adjective, the possessive form of the pronoun they.
"Mine" is a possessive adjective, used to show ownership or possession of something. It is associated with the speaker or writer.
The possessive adjective for it is its. For example:
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The dog caught its tail in the brambles.
Yes, it is a possessive adjective (his shoe), and also a possessive pronoun (the shoe is his).
It is the possessive or genitive case of the singular third-person pronoun used for masculine gender. It is used as a possessive adjective.